Automatic valve.



PATENTED SEPT. 1 1908.

A. J. GEEENAWAY.

AUTOMATIC VALVE. APPLIGATION FILED APR. s, 1902.

UNITED STATES AUTOMATIC VALVE.

To all whom it may concern:

Be it known that I, ARTHUR J. GREENA- WAY, citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have invented acertain new and useful Improvement in Automatic Valves, and declare thefollowing to be a full, clear, and exact description of the same, suchas will enable others skilled in the art to which it pertains to makeand use the same, reference being had to the accompanying drawings,which form a part of this specification.

y invention relates to an improvement in automatic valves, the objectbeing to provide means in a steam heating system, either vacuum orressure,whereby a radiator or other app the, water of condensation,permitting it to flow or be drawn therefrom, and promptly closing whenthe same is exhausted.

It is a well known fact in connection with vacuum systems of steamheating :a system specially designed to use the exhaust from anengme,that a vacuum pump is installed in order to circulate the steamthrough the radiating units and with practically no back pressure on'theengine,the returns from the radiators being connected with the suctionof the pump whereby the water of condensation is removed therefrom.

As before indicated the object of this invention is to produce a valvewhich will permit of the water being drained from the radiator and whichwill automatically close the exhaust opening from the valve the instantsteam reaches the same. I am aware of the fact that numerous valves havebeen devised employing various means to accomplish this result. Thisinvention, however, differs from these inasmuch as it is an-entirelymetallic device, simple in construction, and adapted to the purposewhether-operating under vacuum or pressure.

. With the foregoing in view the invention consists in certain featuresof construction and in a combination of parts described in the followingspecification and more particularly pointed out in the claims.

In the drawings: Figure 1 is a side elevation. Fig. 2 is a centralvertical section of the same. Fig. 3 is a detail View of the valve andits stem, with parts in section.

Referring now to the letters of reference spread upon the drawings: Adenotes the lower portion of the valve body and B a cap or hood portionsecured thereto. The lower Specification of Letters Patent. Applicationfiled April s, 1908. Serial No. 424,871.

lance may be relieved of Patented Sept. 1, 1908.

portion A is cup-shaped to serve as a grit or scale receiving chamber,its vwall being formed with a discharge channel a under the control ofthe valve 0.

D is a thermostatic bar preferably U-shaped in form and composed of twodissimilar metals united together in any suitable manner, but preferablyby riveting the parts together as shown. One end of the bar is rigidlyattached to the wall of the body por tion A, the other being free tomoveupon the expansion and contraction of the metal. Supported in thefree end of the bar D is a pro ecting adjustable stem E, to which issecured,by a ball and socket connection, the disk valve C designedto-close the port a through the action of the thermostatic bar.

F is a union whereby the valve body may be secured to the radiator inthe usual manner and A is the internally'screw threaded hub of the valvebody by which the vacuum pipie (not shown) may be secured tothe valve boy.

Having indicated the several parts by reference letters, theoperation ofthe device will be readily understood. The valve disk 0 is so adjustedwith reference to its seat that it stands normally open. The steam onentering the valve chamber through the connection F, encounters thethermostatic bar D and instantly expands the metal thereby forcing thevalve 0 to its seat and thus closing the discharge port a. Uponcondensation collecting in the valve chamber the thermostatic bar iscaused to contract, which action lifts the valve from its seat wherebythe condensation is from which it flows the action of a vacuum thechamber is relieved from the water of condensation, the steam will againencounter the thermostatic bar forcing the valve C to its seat, it willremain closed until the action just described is repeated.

or is otherwise drawn by pump. As soon as released into the port aHaving thus described my invention, what I claim is 1. In a valve of theclass described having a discharge port, a thermostatic invertedU-shaped bar composed of dissimilar metals riveted together, one of thelegs of said bar being longer than the other with the shorter leg freeto move under the expansion and contraction of the parts, a screwthreaded bolt or rod set transversely through the shorter leg of saidbar and adapted for adjustment, a valve disk, a ball and socket contheshorter leg of adapted for adjustment, and a valve disk,

static bar nection between the valve disk and rod, and

means for securin the longer leg of the thermostatic bar fixe y to thevalve casing.

2. In a valve of the class described includan'inlet and a discharge porta thermoone of the e s of said mg static U-shaped bar, bar being longerthan leg being fixed to the valve casing and the shorter leg being freeto move under the expansion and contraction of the parts, a screwthreaded bolt or rod set transversely through said thermostatic barandconnected to said shorter leg of the thermoformovement into and out ofengagement with the port of the valve, the onger leg of the thermostaticbar having an o ermit of the passage of said pening to ed bolttherethrough when the screw threa rivete the other, t e longer shorterleg is contracted toward the longer 3. In a valve of the classdescribed, having an inlet, and a discharge port a thermostatic,

ARTHUR J. GREENAWAY.

Witnesses:

GRAoE E. WYNKOOP, SAMUEL E. THOMAS.

